ISLE OF MAN. GEOLOGY. LIMESTONE. 56$ 



are not parallel to each other, their direction cannot be 

 more accurately assigned. They ramify at times, in a 

 manner which appears somewhat complicated, many of 

 the branches being very minute. Two or three are more 

 remarkable than the rest, but it is unnecessary to describe 

 either their dimensions or numbers very particularly. 



Where they first appear to the eastward, the stratified 

 limestone terminates abruptly, and is succeeded by a very 

 conspicuous mass of the unstratified rock. The same rock, 

 under circumstances of much confusion, is continued 

 throughout the greater part of the space intersected by 

 these veins ; that confusion being much increased, and 

 considerable difficulty thrown in the way of the examina- 

 tion, by the occurrence of a breccia, which, wherever the 

 limestone is undisturbed, is found in a position superior 

 to it, but is here irregularly intermixed and confounded 

 with the calcareous mass. Hence it is difficult to deter- 

 mine whether the unstratified limestone and the trap veins 

 are every where co-existent ; but whether they are or 

 not in this particular instance, is of no moment, since, 

 in the next example, the latter are found traversing a 

 stratified limestone. The immediate junctions of the veins 

 and the limestone, do not any where appear to be attended 

 with circumstances in the texture of either, sufficiently 

 remarkable to require particular notice. Such changes 

 as are apparent, resemble those now so often described 

 as to have ceased to be objects of curiosity. 



Although the stratified limestone recurs beyond Scarlet 

 point, it never again becomes as regular as before, but 

 continues undulated, distorted, and broken by deep gul- 

 lies, as far as Pool vash. Along this shore it is covered 

 by the same breccia, consisting of fragments of schist 

 and clay intermixed ; by which its real position is much 

 obscured. 



A considerable trap vein is found near the black marble 

 quarry at Pool vash, forming the third and last example 

 of this junction which it appears necessary to describe. 



